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Its a pity that us astronomers can not use the suns energy, Its always there and is free... But unfortunately you need for it to be dark. That is a problem.
No, Deep cycle batteries will not do what you expect. Short term, they are fine. You mention three nights before charge and motor drive, keeping your scope moisture free and running a lap top...No.
You are going to run a gen., Its your safe option, and are not so costly.
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